Her training shoes fly over the asphalt. With each bound, the V-Class parked at the end of the path is a little closer. Just like coming into the home straight at a competition, the black Mercedes V-Class represents the end of a hard workout. But suddenly the runner’s step slow down. Sweat runs from her brow, her calves are burning; there’s only one step between her and giving up. But the idea of breaking off the race at a time like this is not an option for Daniela Ryf. Instead she moves up a gear and sprints the last few metres to the V-Class.